Sizing the Design - Selecting the Array

Last Edit July 22, 2001

Example - AMCC Arrays - Power Supply Options

The power-supply and interface type matrix for the AMCC arrays shows
a very flex ible approach to solving interface problems. Many of the AMCC
arrays can be used with a single power supply (+5V) or dual supplies (+5V/

-5.2V or +5V/-4.5V) as shown in Table 3-15.

The Q5000 and Q20000 Series arrays are bipolar arrays. They use an internal
ECL core (0.5V ECL) and can externally interface to either Schottky TTL,
ECL 10K or to ECL 100K. AMCC arrays allow for the mixed mode operation
of ECL/TTL on the same array, either ECL 10K/TTL or ECL 100K/TTL or all
three. Only one type of ECL may be used for input on a single array. Both
ECL types may be used for output on the same array.

Table 3-15 AMCC Power Supply Options

SINGLE

POWER

SUPPLY

DUAL POWER

SUPPLY

I/O MODE

+5V

-5.2V

-4.5V

+5V/-5.2V

+5V/-4.5V

100% TTL

x

100% ECL 10K

x

x

x

x

x

100% ECL 100K

x

x

x

x

x

ECL10K/TTL

x

x

x

ECL100K/TTL

x

x

x

100% ECL run with dual power supplies is called "DECL".

Table 3-15, with the exception of "DECL", also applies to the
Q24000 Series BiCMOS arrays. They have a CMOS core and bipolar I/O and
they can interface to CMOS.

The concept of mixed ECL-TTL interface on a single array was originated
as a result of customer demand. The idea of operating ECL 10K at ECL 100K
power supplies and visa versa was also the result of customer requests.

Example- communicating to the software

AMCC uses dummy macros called chip macros that allow a user to
specify precisely what array is to be used in what interface mode with
what power supplies. (See Figure 3-4.) The chip macro communicates parameters
to the AMCC MacroMatrix software modules that are performing design validation,
including population and cell type limit checks. The array-specific checks
use chip macro parameters to set limits for TTL outputs, Darlington outputs,
simultaneously switching outputs, bidirectional macro counts, and other
checks.

The AMCCERC software can spot mismatched interface macros and exceeded
macro type limits and issue appropriate error messages. It can also adjust
the DC power module to use the correct power supply in the power computation.